库存是企业管理中的一个重要问题。企业为了防止缺货造成损失,需要留有一定量的库存,但是库存过多必然引起资金积压。因此,人们总是希望能寻求一个在满足生产允许的缺货风险前提下的最低库存备用量,即通常所谓的安全库存量。而安全库存量则主要取决于备运期间需求量的分布规律。 Inventory is an important issue in business management. Enterprises in order to prevent loss caused by out of stock, need to retain a certain amount of inventory, but too much inventory will inevitably lead to capital backlog. Therefore, people always hope to find a minimum stock reserve, which is usually called the safety stock, under the premise of meeting the production-allowed stock-out risk. The safety stock depends mainly on the distribution of demand during shipment.